Is there a scripting call that is identical to the menu 'File/Open' (Ctrl+O)

Question

With the menu File/Open I can pick a directory and a file within. Is there a scripting call that returns the path and file name? boolean OpenFile(string directory, string filename)

Answer 1

I think you are looking for the OpenDialog() command with it's extended signature:

RealNumber opendialog( String selected_path )
Boolean OpenDialog( Window par_win, String prompt, String default_path, String pathname )

As example:

string prompt = "Please select file."
string default = GetApplicationDirectory("open_save",0)
string returned 
if ( OpenDialog(NULL,prompt,default,returned) )
    OKDialog("User selected:\n"+returned)